340 [August, 



K-osenskjold) ; in Smolandia ad Nasbyholm (Boheraan) ; in Vestrogothia (Gyllen- 

 lial)." The species of Silo inhabit running water, and further information is 

 necessary. 



In a subsequent paper (Ueber Agriotypus artnatus, Stettiner Ent. Zeit., 1861, 

 pp. 59 — 61) von Siebold states that he had found the nymphs of Agriotypus also in 

 the cases of Odontocerum albicorne, Scop., and suggests that they may perhaps 

 belong to a larger species, which he would name major. 



Kolenati, in his Gr. et Spec. Tr., pt. i, p. 21, mentions, also from Bohemia, the 

 cases of Aspatherium picicome, Kol., bearing the appendages, but he did not fully 

 understand the phenomenon. 



In the Verhandl. Wien. zool. bot. Ver., 1857, pp. 189, 190, is a notice from 

 V. Kollar (Beitriig zur Kenntniss ueber die geographische Verbreitung des Agriotypus 

 armatus, Walk.) in which the author states that he obtained from Kolenati some 

 cases with the appendages from Bohemia, and that he also found in the collections 

 under his care a female Agriotypus from Styria. 



At a meeting of the Entom. Soc. of London (Trans. Ent. Soc. Lond., Ser. 3, 

 vol. i, Proc, p. 170), Prof. Westwood exhibited cases of Aspatherium picicome from 

 Mentone, with the usual appendages, and said he had extracted a specimen of 

 Agriotypus armatus from one of them. 



In A. Dours' Catalogue Systematique des Hymenopteres de la France, p. 52, 

 the author repeats the known fact that Agriotypus is a parasite of Aspatherium 

 picicome, and says : — " Cette Phryganide lorsqu'elle est habitee par le parasite se 

 recommit a. un appendice filiform qu'elle porte a sa partie caudale." I hope to show 

 that the appendage is carried at the head end of the case. 



A review of the literature on Agriotypus is given by Mr. E. A. Fitch in the 

 Entomologist, vol. xvii, June, 1884. 



My attention was called to the Agrioti/pus during the exploration 

 of the rivers Divoka and Ticha Orlice in Eastern Bohemia, which I 

 undertook with the help of the Committee for physical exploration 

 of Bohemia, and especially with the aid of Dr. Ant. Eric, in July 

 last year. I found agriotypized cases not only in both rivers above 

 named, but also in many brooks and springs which flow into them. 

 The cases belonged to Silo pallipes, and contained fully grown larvae, 

 or what I will name " subnymphs " of the parasite. 



Arrived at home I revised all the materials collected on my 

 journeys through Bohemia, and was happy to find very many agrio- 

 typized cases from various localities, and at different seasons. 



In the second half of April this year, I made, especially for this 

 purpose, a journey to Litomyshle in Eastern Bohemia, where I was sure 

 to find the Agriotypus, and I came just at the time it was beginning 

 to fly. April 22nd, when I came to the brook, was a very sunny 

 and hot day. The Agriotypus was flying above the water and along 

 the banks, and swarming in a manner like ants. I also observed a 

 female descending a stem of grass beneath the water, in a place where 



